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A coal-fired unit boiler high-pressure feed water micro-oxygen precise control method and device

A technology for high-pressure water supply and coal-fired units, applied in water treatment parameter control, water supply control, chemical instruments and methods, etc., can solve problems such as spalling effect, accelerated superheater, etc., achieve low risk, reduce deposition rate and salt accumulation rate , the effect of convenient operation

Active Publication Date: 2015-12-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, the oxidative treatment method also has certain disadvantages: too high dissolved oxygen in the steam does have an impact on accelerating the growth and peeling of superheater and reheater scale

Method used

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  • A coal-fired unit boiler high-pressure feed water micro-oxygen precise control method and device
  • A coal-fired unit boiler high-pressure feed water micro-oxygen precise control method and device

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Embodiment 1

[0024] Such as figure 2 As shown, a coal-fired unit boiler high-pressure feed water micro-oxygen precision control device, which includes sequentially connected oxygen cylinder group 8, a first pressure reducing valve 9 and a second pressure reducing valve 12, the first pressure reducing valve 9 The pipeline between the second decompression valve 12 is composed of 5 oxygenation branches connected in parallel; a valve 10 and a flow meter 11 are arranged on the oxygenation branch; the oxygenation branch is a stainless steel with an effective diameter of 1mm Tube. The second decompression valve 12 is connected to the feed water oxygenation point. The oxygen cylinder group 8 is several oxygen cylinders.

[0025]A precise control method for micro-oxygen in high-pressure feed water of a coal-fired unit boiler, specifically: before adding oxygen to the feed water, stop adding hydrazine, close the exhaust valve of the deaerator, and control the hydrogen conductance of the thermal s...

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Abstract

The invention discloses a high-pressure water supply micro-aerobic accurate control method for a coal-fired unit boiler. Before oxygenation, addition of hydrazine is stopped; an exhaust valve of a deaerator is closed; the hydrogen conductivity value of a thermodynamic system is controlled to be smaller than 0.15mus / cm; the dissolved oxygen range of the deaerator outlet is controlled to be 30-50mug / L at an early stage of transformation; the dissolved oxygen range of the deaerator outlet is controlled to be 10-30mug / L at the middle stage of transformation; the dissolved oxygen range of an economizer inlet is controlled to be 10-20mug / L at the later stage of transformation; when the dissolved oxygen representation number of the economizer inlet is smaller than 60% of the dissolved oxygen representation number of the deaerator outlet, the early stage of transformation is recorded; when the dissolved oxygen representation number of the economizer inlet is 60%-70% that of the deaerator outlet, the middle stage of transformation is recorded; and when the dissolved oxygen representation number of the economizer inlet is greater than 70% of the dissolved oxygen representation number of the deaerator outlet, the later stage of transformation is recorded. According to the method, the metal material corrosion and salt deposition rates of the thermodynamic system of a coal-fired unit can be reduced, and the tube explosion risks of a superheater and a reheater are reduced.

Description

technical field [0001] The invention belongs to the technical field of boiler feed water treatment for coal-fired units, and in particular relates to a precise control method and device for micro-oxygen in high-pressure feed water for coal-fired unit boilers. Background technique [0002] As the circulating working medium of the thermal equipment of thermal power units, water vapor plays an important role in realizing the energy conversion of the units. Water vapor quality and feed water treatment methods are of great significance to the corrosion protection, operating life and safe and economical operation of thermal equipment. In order to reduce the corrosion rate of metal materials in the boiler thermal system of coal-fired units and the scaling and salt accumulation rate of thermal equipment, avoid Flow Accelerated Corrosion (FAC) and improve the safety and economy of unit operation, the metal materials, Choose the appropriate treatment method for water quality and char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72F22D5/00C23F15/00
CPCC02F1/727C02F2209/22C02F2303/08C23F15/005F22D5/00
Inventor 张小霓吴文龙王锋涛常亮
Owner STATE GRID CORP OF CHINA
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